Lennart Ackermans
@lennartack.bsky.social
Philosopher of science and formal ethicist @ MCMP Munich. Into causation, Bayesian epistemology, discrimination, economics, social science. https://lennart.phd
New: Journal of Mathematical Philosophy
New: Journal of Mathematical Philosophy - Daily Nous
The Journal of Mathematical Philosophy is a new open-access journal. According to an announcement from its editors, the journal is "the first open access journal that is devoted to mathematical philos...
dailynous.com
Together with Jürgen Landes I started the Journal of Mathematical Philosophy. Please send us your work! mathematicalphilosophy.org/mathphil
Munich Center for Mathematical Philosophy@lmu-mcmp.bsky.social · 2w agoJournal launch: The *Journal of Mathematical Philosophy* aims to publish high-quality research articles in all areas of mathematical philosophy (broadly understood), offering open access at no cost to authors. Submissions of manuscripts are now welcome at: mathematicalphilosophy.org/mathphil
In this new publication, I respond to the courageous attempt by @joelpust.bsky.social to save double halfing (it didn't succeed). doi.org/10.1111/phib...
A Double‐Halfer Embarrassment: Response to Pust
Michael Titelbaum introduced a variant of the Sleeping Beauty problem in which a coin is tossed on both Monday and Tuesday, with the Tuesday toss not affecting Beauty's condition. Titelbaum argues th...
doi.org
Could smartphones be causing declining birth rates? This is the first time I read about a hypothesis that seems remotely plausible. www.ft.com/content/fba3...
My own paper about the Two-Envelope Paradox is now published in Mind! doi.org/10.1093/mind...
Four Formal Versions of the Two-Envelope Paradox
Abstract. Philosophical discussion of the two-envelope paradox has suffered from a lack of formal precision. I discuss various versions of the paradoxical
doi.org
Lennart Ackermans@lennartack.bsky.social · last yr.When reading the literature on the Two-Envelope "Paradox" I got annoyed by how much confusion is created by treating probabilities very informally. Glad to see that my former maths teacher @gill1109.bsky.social agrees! (doi.org/10.1111/anzs...)
Finally made a portfolio website! (With the help of Claude Code, since I was too lazy too make it on my own.) lennart.phd
About me
Personal website of Lennart Ackermans
lennart.phd
Just accepted by Australasian Philosophical Review: "Factual Difference-Making is Equivalent to a Counterfactual Theory". philsci-archive.pitt.edu/25508/. A commentary to a theory of actual causation by Mario Günther and Holger Andreas.
Factual Difference-Making is Equivalent to a Counterfactual Theory - PhilSci-Archive
philsci-archive.pitt.edu
When reading the literature on the Two-Envelope "Paradox" I got annoyed by how much confusion is created by treating probabilities very informally. Glad to see that my former maths teacher @gill1109.bsky.social agrees! (doi.org/10.1111/anzs...)
Trying to get Deepseek to talk about Xi Jinping proves challenging...
Good read. But how do we get probabilistic explanation without metaphysical chances? On the below account "The ice cube melted because the chance of this happening was high" becomes "The ice cube melted because my beliefs have certain symmetries leading to a high credence". That can't be right!
Cailin O’Connor@cailinmeister.bsky.social · 2y ago![Theorem. If $n$ is an integer and $n^2$ is even, then $n$ is itself even.
Proof. Contrapositives are for cowards, so assume $n$ is an integer and $n^2$ is even. Then $n^2=2k$ for some integer $k$, and thus $n^2-2k=0$. Behold:
\[ n = n + (n^2-2k) = n(n+1)-2k. \]
Both $n(n+1)$ and $2k$ are even, so $n$ is even.
QED.](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:4wrxafbsjycxbpjo4e42ht6q/bafkreihucnue4bdyzulcrzddytan5ttdx56rg5ci6cn4vhxw5lebnbdzma)